Function ATExecDetachPartitionFinalize

src/backend/commands/tablecmds.c:22560–22586

* ALTER TABLE ... DETACH PARTITION ... FINALIZE * * To use when a DETACH PARTITION command previously did not run to * completion; this completes the detaching process. */

 * completion; this completes the detaching process.
 */
static ObjectAddress
ATExecDetachPartitionFinalize(Relation rel, RangeVar *name)
{
	Relation	partRel;
	ObjectAddress address;
	Snapshot	snap = GetActiveSnapshot();

	partRel = table_openrv(name, AccessExclusiveLock);

	/*
	 * Wait until existing snapshots are gone.  This is important if the
	 * second transaction of DETACH PARTITION CONCURRENTLY is canceled: the
	 * user could immediately run DETACH FINALIZE without actually waiting for
	 * existing transactions.  We must not complete the detach action until
	 * all such queries are complete (otherwise we would present them with an
	 * inconsistent view of catalogs).
	 */
	WaitForOlderSnapshots(snap->xmin, false);

	DetachPartitionFinalize(rel, partRel, true, InvalidOid);

	ObjectAddressSet(address, RelationRelationId, RelationGetRelid(partRel));

	table_close(partRel, NoLock);

	return address;
}

/*
 * DetachAddConstraintIfNeeded